Method, device and computer readable medium for channel state information transmission

Abstract

Embodiments of the present disclosure relate to methods, devices and computer readable media for Channel State Information (CSI) transmission. In example embodiments, a method for communication includes determining a payload of channel state information for at least one transmission layer, the at least one transmission layer used for communication between a terminal device and a network device; in response to a determination that the payload exceeds a capacity of available uplink resources, discarding a portion of the channel state information, the discarded portion at least comprising an indication specific to one of the at least one transmission layer; and transmitting, to the network device, remaining portion of the channel state information.

What is claimed is: 
     
         1 . A method for communication, comprising:
 determining a payload of channel state information for at least one transmission layer, the at least one transmission layer used for communication between a terminal device and a network device;   in response to a determination that the payload exceeds a capacity of available uplink resources, discarding a portion of the channel state information, the discarded portion at least comprising an indication specific to one of the at least one transmission layer; and   transmitting, to the network device, remaining portion of the channel state information.   
     
     
         2 . The method of  claim 1 , wherein discarding the portion of the channel state information comprising:
 determining, from the channel state information, a group of layer-specific indications for at least one of the at least one transmission layer; and   discarding the group of layer-specific indications.   
     
     
         3 . The method of  claim 2 , wherein the group includes layer-specific indications for all of the at least one transmission layer, the method further comprising:
 determining, from the channel state information, a group of layer-common indications for all of the at least one transmission layer; and   discarding the group of layer-common indications.   
     
     
         4 . The method of  claim 1 , wherein discarding the portion of the channel state information comprising:
 determining a first number of non-zero coefficients for a first transmission layer of the at least one transmission layer, the first number of non-zero coefficients indicating a number of pairs of amplitude indication and phase indication for a gain to be reported to the network device;   selecting the first number of pairs of amplitude indication and phase indication from a first plurality of pairs of amplitude indication and phase indication for the first transmission layer;   updating a non-zero coefficient indication for the first transmission layer based on the first number of pairs of amplitude indication and phase indication, the non-zero coefficient indication indicating positions of the first number of pairs of amplitude indication and phase indication; and   discarding at least one pair of amplitude indication and phase indication in the first plurality of pairs of amplitude indication and phase indication other than the first number of pairs of amplitude indication and phase indication.   
     
     
         5 . The method of  claim 4 , wherein selecting the first number of pairs of amplitude indication and phase indication comprising:
 determining an amplitude value for each pair of the first plurality of pairs of amplitude indication and phase indication; and   selecting the first number of pairs of amplitude indication and phase indication based on the determined amplitude values.   
     
     
         6 . The method of  claim 1 , wherein discarding the portion of the channel state information comprising:
 determining a second number of non-zero coefficients for a group of the at least one transmission layer, the second number of non-zero coefficients indicating a number of pairs of amplitude indication and phase indication for a gain to be reported to the network device;   selecting the second number of pairs of amplitude indication and phase indication from a second plurality of pairs of amplitude indication and phase indication for all of the at least one transmission layer;   updating a non-zero coefficient indication for each of the at least one transmission layer based on the second number of pairs of amplitude indication and phase indication, the non-zero coefficient indication indicating positions of the selected pairs of amplitude indication and phase indication for respective transmission layer; and   discarding at least one pair of amplitude indication and phase indication in the second plurality of pairs of amplitude indication and phase indication other than the second number of pairs of amplitude indication and phase indication.   
     
     
         7 . The method of  claim 6 , wherein selecting the second number of pairs of amplitude indication and phase indication comprising:
 determining an amplitude value for each pair of the second plurality of pairs of amplitude indication and phase indication; and   selecting the second number of pairs of amplitude indication and phase indication based on the determined amplitude values.   
     
     
         8 . The method of  claim 1 , wherein discarding the portion of the channel state information comprising:
 determining a polarization with a lower magnitude from two polarizations for a second transmission layer of the at least one transmission layer;   selecting a third number of pairs of amplitude indication and phase indication corresponding to the selected polarization, from a third plurality of pairs of amplitude indication and phase indication for the second transmission layer;   updating a non-zero coefficient indication for the second transmission layer based on the third number of pairs of amplitude indication and phase indication, the non-zero coefficient indication indicating positions of the third number of pairs of amplitude indication and phase indication; and   discarding at least one pair of amplitude indication and phase indication in the third plurality of pairs of amplitude indication and phase indication other than the third number of pairs of amplitude indication and phase indication.   
     
     
         9 . A method for communication, comprising:
 determining an ordered subset of frequency domain (FD) basis for at least one transmission layer, the at least one transmission layer configured for communication between a terminal device and a network device, the ordered subset of FD basis selected from an ordered set of FD basis;   determining an intermediate set of FD basis by a shifting operation based on the ordered subset of FD basis; and   transmitting at least a number indication to the network device as part of channel state information, the number indication indicating a number of FD basis in the intermediate set.   
     
     
         10 . The method according to  claim 9 , wherein determining the ordered subset of FD basis for the at least one transmission layer comprises:
 determining a first ordered subset of FD basis for a first transmission layer and a second ordered subset of FD basis for a second transmission layer, the first transmission layer being different from the second transmission layer; and   wherein determining the intermediate set of FD basis comprises:   determining a union set of FD basis based on a union of the first ordered subset of FD basis and the second ordered subset of FD basis; and   performing the shifting operation on FD bases in the union set of FD basis to obtain the intermediate set of FD basis.   
     
     
         11 . The method of  claim 9 , wherein determining the ordered subset of FD basis for the at least one transmission layer comprises:
 determining a first ordered subset of FD basis for a first transmission layer and a second ordered subset of FD basis for a second transmission layer, the first transmission layer being different from the second transmission layer; and   wherein determining the intermediate set of FD basis comprises:   performing the shifting operation on FD bases in the first ordered subset of FD basis and the second ordered subset of FD basis independently to obtain a first shifted version of the first ordered subset of FD basis and a second shifted version of the second ordered subset of FD basis; and   determining the intermediate set of FD basis based on a union of the first shifted version and the second shifted version.   
     
     
         12 . The method of  claim 11 , further comprising:
 determining a set indication to indicate FD bases in the intermediate set of FD basis; and   transmitting the set indication to the network device as part of the channel state information.   
     
     
         13 . The method of  claim 9 , further comprising:
 determining a selection indication for the at least one transmission layer based on mapping between the ordered subset of FD basis and the intermediate set of FD basis, the selection indication indicating a selection of FD bases in the intermediate set; and   transmitting the selection indication to the network device as part of the channel state information.   
     
     
         14 . A method for communication, comprising:
 determining a plurality of subbands for a terminal device, the plurality of subbands being continuously distributed in frequency domain or spaced apart evenly in frequency domain; and   transmitting a subband indication for the plurality of subbands to the terminal device to enable channel state estimation by the terminal device on the plurality of subbands.   
     
     
         15 . The method of  claim 14 , wherein transmitting the subband indication for the plurality of subbands comprises transmitting at least one of:
 an indication of a starting subband and an indication of a number of subbands in the plurality of subbands;   an indication of the starting subband and an indication of an ending subband;   an indication of the starting subband, an indication of the number of subbands in the plurality of subbands and an indication of an offset between adjacent subbands in the plurality of subbands;   an indication of the starting subband, an indication of the ending subband and an indication of the offset between adjacent subbands in the plurality of subbands; and   an indication of positions of the plurality of subbands in a wideband.   
     
     
         16 . A method for communication, comprising:
 receiving a subband indication for a plurality of subbands from a network device, the plurality of subbands being continuously distributed in frequency domain or spaced apart evenly in frequency domain;   determining the plurality of subbands based on the subband indication; and   performing channel state estimation on the plurality of subbands.   
     
     
         17 . The method of  claim 16 , wherein receiving the subband indication for the plurality of subbands comprises receiving at least one of:
 an indication of a starting subband and an indication of a number of subbands in the plurality of subbands;   an indication of the starting subband and an indication of an ending subband;   an indication of the starting subband, an indication of the number of subbands in the plurality of subbands and an indication of an offset between adjacent subbands in the plurality of subbands;   an indication of the starting subband, an indication of the ending subband and an indication of the offset between adjacent subbands in the plurality of subbands; and   an indication of positions of the plurality of subbands in a wideband.   
     
     
         18 . A device, comprising:
 a processor; and   a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the apparatus to perform the method according to any of  claims 1 - 8 .   
     
     
         19 . A device, comprising:
 a processor; and   a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the apparatus to perform the method according to any of  claims 9 - 13 .   
     
     
         20 . A device, comprising:
 a processor; and   a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the apparatus to perform the method according to any of  claims 14 - 15 .   
     
     
         21 . A device, comprising:
 a processor; and   a memory coupled to the processing unit and storing instructions thereon, the instructions, when executed by the processing unit, causing the apparatus to perform the method according to any of  claims 16 - 17 .   
     
     
         22 . A computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any of  claims 1 - 8 . 
     
     
         23 . A computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any of  claims 9 - 13 . 
     
     
         24 . A computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any of  claims 14 - 15 . 
     
     
         25 . A computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to any of  claims 16 - 17 .